The review centers around whether the award for drone pilots and cyber warriors should outrank those typically awarded for actions under fire — in specific the bronze star and purple heart.

From the Washington Post:

A letter from the Senate’s top two leaders on military affairs asking Hagel to reconsider was waiting on his desk when he returned Monday from a trip to Afghanistan. He made the decision Monday evening, according to a defense official who spoke on condition of anonymity before an official announcement planned for Tuesday afternoon.

Hagel is himself a former enlisted infantrymen, and a two-time recipient of the Purple Heart award.